First slide

Kinetic theory of ideal gases

Question

According to kinetic theory of gases, at absolute zero temperature,

Moderate

A

RMS speed becomes zero but some molecules can still move about
B

Average speed becomes zero but some molecules can still move about
C

Most probable speed becomes zero but some molecules can still move about
D

None of the statements is true

Solution

At absolute zero, T = 0.
Hence, $v_{RMS} = \sqrt{\frac{3 R T}{M}} = 0; v_{A V G} = \sqrt{\frac{8 R T}{π M}} = 0; v_{M P} = \sqrt{\frac{2 R T}{M}} = 0$ .

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